Observation of Giant Resonances in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mn>4</mml:mn><mml:mo>,</mml:mo><mml:mn>2</mml:mn><mml:mn>5</mml:mn><mml:mo>,</mml:mo><mml:mn>2</mml:mn><mml:mn>6</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math

Kiss, Á.; Mayer‐Böricke, C.; Rogge, M.; Turek, P.; Wiktor, S.

doi:10.1103/physrevlett.37.1188

Cited by 53 publications

(8 citation statements)

References 5 publications

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“…Moreover, the 27 Al excitation energy spectra shows two broad structures at about 20 and 24 MeV. The first one is identified as the GQR of the 27 Al, also observed in previous ( , ') experiments [82], while the second could be another collective mode, like the isoscalar GMR, not observed before. This is a qualitative interpretation that requires a careful analysis and proper theoretical explanation.…”

Section: Search For Nuclear Rainbow In Heavy-ion Elastic Scatteringsupporting

confidence: 78%

The MAGNEX spectrometer: Results and perspectives

et al. 2016

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This article discusses the main achievements and future perspectives of the MAGNEX spectrometer at the INFN-LNS laboratory in Catania (Italy). MAGNEX is a large acceptance magnetic spectrometer for the detection of the ions emitted in nuclear collisions below Fermi energy. In the first part of the paper an overview of the MAGNEX features is presented. The successful application to the precise reconstruction of the momentum vector, to the identification of the ion masses and to the determination of the transport efficiency is demonstrated by in-beam tests. In the second part, an overview of the most relevant scientific achievements is given. Results from nuclear elastic and inelastic scattering as well as from transfer and charge exchange reactions in a wide range of masses of the colliding systems and incident energies are shown. The role of MAGNEX in solving old and new puzzles in nuclear structure and direct reaction mechanisms is emphasized. One example is the recently observed signature of the long searched Giant Pairing Vibration. Finally, the new challenging opportunities to use MAGNEX for future experiments are briefly reported. In particular, the use of double charge exchange reactions toward the determination of the nuclear matrix elements entering in the expression of the half-life of neutrinoless double beta decay is discussed. The new NUMEN project of INFN, aiming at these investigations, is introduced. The challenges connected to the major technical upgrade required by the project in order to investigate rare processes under high fluxes of detected heavy ions are outlined. Magnetic spectrometers in Nuclear Reaction studies .

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Section: Search For Nuclear Rainbow In Heavy-ion Elastic Scatteringsupporting

confidence: 78%

The MAGNEX spectrometer: Results and perspectives

et al. 2016

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“…The data agree well with those from previous (a, a') experiments 8 In an adjacent nucleus with a higher level density like 27 A1, the GQR shows much less dramatic amplitude modulations. 12 Following a suggestion of Balashov et aZ., 13 we present, in Figs. 2(b)-2(e), the (a, a') strength distributions of the relevant decay channels (c = a 0 , (y 19 p Q ,P u2 ) as observed in "antiquasifree kinematics" demanding particle c to be detected opposite to the recoil direction (0^ + 180°).…”

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confidence: 68%

Direct Decays of the Isoscalar Giant Quadrupole Resonance inSi28

et al. 1981

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The isoscalar giant quadrupole resonance in 28 Si, studied by 2 Si (a, a'c) angular correlation experiments (in which the charged particle c =a Qi a u p Qt pi % $, constitutes the first obvious case of a dominant direct nucleon decay of a giant quadrupole resonance.PACS numbers: 24.30.Cz, 23.90,+ w, 25.60 The general question of the damping of highfrequency nuclear vibrations is of definite interest, but many important issues are not well understood theoretically or experimentally. 1 Does the initial coherent one-particle-one-hole (Ip-lh) excitation decay in a "direct decay" by emitting the unbound nucleon, leaving the residual nucleus in specific hole states, or is the information on the Ip-lh configuration lost in a slower "statistical decay" through more complex n^-nh degrees of freedom and the eventual evaporation ? Random-phase approximation (RPA) continuum calculations predict direct decay to be unimportant in heavy nuclei for both the isoscalar giant quadrupole resonance (GQR) and the giant dipole resonance (GDR); for the GQR this prediction holds even for very light nuclei (A -16). 1 Experimentally, the results of the few kinematically complete studies of the GQR decay have been found to be compatible with the assumption of statistical decay in the mass region A ~ 40-70. 2_4 On the other hand, a m O(a 9 a'c) coincidence experiment 5 (in which c = a 0 , a 2 ,/> 0? £ li2 ) gives the first evidence for a dominant direct decay of a GQR which surprisingly did not manifest itself in a nucleon but rather in the a-decay channel. Significantly, this observation was traced back later to the microscopic SU(3) structure of the GQR. 6 We briefly present here some results of .Cy, 27.30.+ t an extensive study 7 of the GQR decay in 28 Si which exhibits for the first time the characteristics expected for direct decay, namely a resonant strength distribution in specific nucleon (proton) channels.The charged-particle (c) decays from the GQR region in 28 Si were studied via the 28 Si(a, a*c) reaction with use of the momentum-analyzed 155-MeV a -particle beam from the Julich cyclotron. The a' particles were detected by two AE-E telescopes at fixed angles of Q a , =6.5° and 13.5°, corresponding to the second and third maximum of the L = 2 (a, a') angular distribution. As described previously, 4 ' 5 decay products were measured in coincidence by four sets of AE-E 1 -E 2 telescopes providing a unique particle identification for energies E c^2 .8 MeV. The measured in-plane angular correlation functions (ACF's) cover the range of laboratory angles 0 C between -40° and -260° (+100°) including both the direction parallel (#^=-56° for E x =19 MeV) and antiparallel to the recoiling excited 28 Si nucleus. Figure 1 shows a singles a' energy spectrum taken during the coincidence runs at 6.5° with a resolution of 180 keV. The data agree well with those from previous (a, a') experiments 8,9 confirming both the deduced centroid energy {(E x )-= 19.7 MeV) and width (r FWHM = 5.1 MeV) of the GQR covering the range of excitation energy of...

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“…The present study is the first application of this method and is devoted to giant resonances in the s-d shell nuclei, 22−28 Mg and 26−30 Si. Many experimental results are available for light nuclei [30,31,32,33,34,35,36,37,38,39,40] and a recent reanalysis of experimental data in 28 Si shows that giant resonances in these nuclei are still of great interest [40]. These Magnesium and Silicon isotopes display different ground state deformations, then they are good candidates for studying the impact of intrinsic deformation on giant resonances.…”

Section: Introductionmentioning

confidence: 99%

Role of deformation on giant resonances within the QRPA approach and the Gogny force

Peru,

Goutte

2008

Preprint

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Fully consistent axially-symmetric-deformed Quasi-particle Random Phase Approximation (QRPA) calculations have been performed, in which the same Gogny D1S effective force has been used for both the Hartree-Fock-Bogolyubov mean field and the QRPA approaches. Giant resonances calculated in deformed 26−28 Si and 22−24 Mg nuclei as well as in the spherical 30 Si and 28 Mg isotopes are presented. Theoretical results for isovector-dipole and isoscalar monopole, quadrupole, and octupole responses are presented and the impact of the intrinsic nuclear deformation is discussed.

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Observation of Giant Resonances inMg24,25,26and
Á. Kiss
¹
,
C. Mayer‐Böricke
²
,
M. Rogge
³

et al.

Cited by 53 publications

References 5 publications

The MAGNEX spectrometer: Results and perspectives

The MAGNEX spectrometer: Results and perspectives

Direct Decays of the Isoscalar Giant Quadrupole Resonance inSi28

Role of deformation on giant resonances within the QRPA approach and the Gogny force

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Observation of Giant Resonances inMg24,25,26andÁ. Kiss1, C. Mayer‐Böricke2, M. Rogge3 et al.

Cited by 53 publications

References 5 publications

The MAGNEX spectrometer: Results and perspectives

The MAGNEX spectrometer: Results and perspectives

Direct Decays of the Isoscalar Giant Quadrupole Resonance inSi28

Role of deformation on giant resonances within the QRPA approach and the Gogny force

Contact Info

Product

Resources

About

Observation of Giant Resonances inMg24,25,26and
Á. Kiss
¹
,
C. Mayer‐Böricke
²
,
M. Rogge
³

et al.